Question 43. What Is The Underlying Hypervisor For Ec2 ? Answer : Xen Question 44. What Are Spot Instances In Amazon Ec2 ? Answer : In Amazon EC2, we can even bid for getting a computing instance. Any instance procured by bidding is a Spot Instance. Multiple users bid for an EC2 Instance. Once the bid price exceeds the Spot price, the user with the highest bid gets it. As long as their bid price remains higher than the Spot price, they can keep using it. Spot price varies with the supply and demand. Once Spot price exceeds Bid price, the instance will be taken back from the user.
Question 48. What Is A Placement Group In Ec2 ? Answer : AWS provides an option of creating a Placement Group in EC2 to logically group the instances within as single Availability Zone. We get the benefits of low network latency and high network throughput by using a Placement Group. Placement Group is a free option as of now. When we stop an instance, it will run in same Placement Group in restart at a later point of time. The biggest limitation of Placement Group is that we cannot add Instances from multiple availability zones to one Placement Group. Question 49. What Types Of Issues Do You Face While Connecting To An Ec2 Instance ? Answer : Some of the possible connection issues with EC2 instance are: Connection time out Permission denied due to host key not found Unprotected private key file Permission denied due to user key not recognized by server No supported authentication method available Server refused the key AWS Video Training
Question 24. How To Migrate An Instance To Another Availability Zone ? Answer : You can migrate your EC2 instance from one Availability Zone to another. Following are the steps to migrate an Instance to another Availability Zone: Create an AMI from the running instance Launch an instance from the AMI that you just created, specify the new Availability Zone You can use the same instance type as the original instance, or select a new instance type If the original instance has an associated Elastic IP address, then associate it with the new instance If the original instance is a Reserved Instance, change the Availability Zone for your reservation
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